package part1;

public class CinemaLighting {
    private static final CinemaLighting INSTANCE = new CinemaLighting();

    public static CinemaLighting getInstance() {
        return INSTANCE;
    }

    public void on() {
        System.out.println("开启灯光");
    }

    public void off() {
        System.out.println("关闭灯光");
    }

    public void up() {
        System.out.println("调亮");
    }

    public void down() {
        System.out.println("调暗");
    }
}
